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Mapping Quantum Circuits to Modular Architectures with QUBO

Bandic, M. (author), Prielinger, L.P. (author), Nublein, Jonas (author), Ovide, Anabel (author), Rodrigo, Santiago (author), van Someren, J. (author), Vardoyan, G.S. (author), Almudever, Carmen G. (author), Feld, S. (author)

Modular quantum computing architectures are a promising alternative to monolithic QPU (Quantum Processing Unit) designs for scaling up quantum devices. They refer to a set of interconnected QPUs or cores consisting of tightly coupled quantum bits that can communicate via quantum-coherent and classical links. In multi-core architectures, it is...

conference paper 2023

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Mapping quantum algorithms to multi-core quantum computing architectures

Ovide, Anabel (author), Rodrigo, Santiago (author), Bandic, M. (author), van Someren, J. (author), Feld, S. (author), Abadal, Sergi (author), Alarcon, Eduard (author), Almudever, Carmen G. (author)

Current monolithic quantum computer architectures have limited scalability. One promising approach for scaling them up is to use a modular or multi-core architecture, in which different quantum processors (cores) are connected via quantum and classical links. This new architectural design poses new challenges such as the expensive inter-core...

conference paper 2023

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Scalable multi-chip quantum architectures enabled by cryogenic hybrid wireless/quantum-coherent network-in-package

Alarcon, Eduard (author), Abadal, Sergi (author), Sebastiano, F. (author), Babaie, M. (author), Charbon-Iwasaki-Charbon, E. (author), Bolivar, Peter Haring (author), Palesi, Maurizio (author), Staszewski, R.B. (author), Almudever, Carmen G. (author)

The grand challenge of scaling up quantum computers requires a full-stack architectural standpoint. In this position paper, we will present the vision of a new generation of scalable quantum computing architectures featuring distributed quantum cores (Qcores) interconnected via quantum-coherent qubit state transfer links and orchestrated via...

conference paper 2023

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Interaction graph-based characterization of quantum benchmarks for improving quantum circuit mapping techniques

Bandic, M. (author), Almudever, Carmen G. (author), Feld, S. (author)

To execute quantum circuits on a quantum processor, they must be modified to meet the physical constraints of the quantum device. This process, called quantum circuit mapping, results in a gate/circuit depth overhead that depends on both the circuit properties and the hardware constraints, being the limited qubit connectivity a crucial...

journal article 2023

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Realization of a quantum neural network using repeat-until-success circuits in a superconducting quantum processor

Vlothuizen, W.J. (author), Ferreira Marques, J.M. (author), van Straten, J. (author), Ali, H. (author), Muthusubramanian, N. (author), Zachariadis, C. (author), van Someren, J. (author), Beekman, M. (author), Haider, S.N. (author), Bruno, A. (author), Almudever, Carmen G. (author), DiCarlo, L. (author)

Artificial neural networks are becoming an integral part of digital solutions to complex problems. However, employing neural networks on quantum processors faces challenges related to the implementation of non-linear functions using quantum circuits. In this paper, we use repeat-until-success circuits enabled by real-time control-flow...

journal article 2023

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SpinQ: Compilation Strategies for Scalable Spin-Qubit Architectures

Paraskevopoulos, N. (author), Sebastiano, F. (author), Almudever, Carmen G. (author), Feld, S. (author)

Despite Noisy Intermediate-Scale Quantum devices being severely constrained, hardware- and algorithm-aware quantum circuit mapping techniques have been developed to enable successful algorithm executions. Not so much attention has been paid to mapping and compilation implementations for spin-qubit quantum processors due to the scarce...

journal article 2023

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Quantum Computing: From Hardware to Society

Vermaas, P.E. (author), Wimmer, M.T. (author), Lomas, J.D. (author), Almudever, Carmen G. (author), Scappucci, G. (author)

This magazine is both an introduction into quantum computing and an exploration of its impact on our world. It follows on from our 2019 magazine on the quantum internet. Since 2019, much progress has been made in quantum technologies worldwide. In 2020, for instance, the first European quantum computer came online in Delft. Although this is...

report 2022

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Topological-Graph Dependencies and Scaling Properties of a Heuristic Qubit-Assignment Algorithm

Steinberg, M.A. (author), Feld, S. (author), Almudever, Carmen G. (author), Marthaler, Michael (author), Reiner, Jan Michael (author)

The qubit-mapping problem aims to assign and route qubits of a quantum circuit onto an noisy intermediate-scale quantum (NISQ) device in an optimized fashion, with respect to some cost function. Finding an optimal solution to this problem is known to scale exponentially in computational complexity; as such, it is imperative to investigate...

journal article 2022

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OpenQL: A Portable Quantum Programming Framework for Quantum Accelerators

Khammassi, N. (author), Ashraf, I. (author), van Someren, J. (author), Nane, R. (author), Krol, A.M. (author), Rol, M.A. (author), Lao, L. (author), Bertels, K.L.M. (author), Almudever, Carmen G. (author)

With the potential of quantum algorithms to solve intractable classical problems, quantum computing is rapidly evolving, and more algorithms are being developed and optimized. Expressing these quantum algorithms using a high-level language and making them executable on a quantum processor while abstracting away hardware details is a...

journal article 2022

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Characterizing the spatio-temporal qubit traffic of a quantum intranet aiming at modular quantum computer architectures

Rodrigo, Santiago (author), Spanò, Domenico (author), Bandic, M. (author), Abadal, Sergi (author), van Someren, J. (author), Ovide, Anabel (author), Feld, S. (author), Almudéver, Carmen G. (author), Alarcón, Eduard (author)

Quantum many-core processors are envisioned as the ultimate solution for the scalability of quantum computers. Based upon Noisy Intermediate-Scale Quantum (NISQ) chips interconnected in a sort of quantum intranet, they enable large algorithms to be executed on current and close future technology. In order to optimize such architectures, it is...

conference paper 2022

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Full-stack quantum computing systems in the NISQ era: Algorithm-driven and hardware-aware compilation techniques

Bandic, M. (author), Feld, S. (author), Almudever, Carmen G. (author)

The progress in developing quantum hardware with functional quantum processors integrating tens of noisy qubits, together with the availability of near-term quantum algorithms has led to the release of the first quantum computers. These quantum computing systems already integrate different software and hardware components of the so-called “full...

conference paper 2022

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QiBAM: Approximate Sub-String Index Search on Quantum Accelerators Applied to DNA Read Alignment

Sarkar, A. (author), Al-Ars, Z. (author), Almudever, Carmen G. (author), Bertels, K.L.M. (author)

With small-scale quantum processors transitioning from experimental physics labs to industrial products, these processors in a few years are expected to scale up and be more robust for efficiently computing important algorithms in various fields. In this paper, we propose a quantum algorithm to address the challenging field of data processing...

journal article 2021

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Timing and Resource-aware Mapping of Quantum Circuits to Superconducting Processors

Lao, L. (author), van Someren, J. (author), Ashraf, I. (author), Almudever, Carmen G. (author)

Quantum algorithms need to be compiled to respect the constraints imposed by quantum processors, which is known as the mapping problem. The mapping procedure will result in an increase of the number of gates and of the circuit latency, decreasing the algorithm's success rate. It is crucial to minimize mapping overhead, especially for noisy...

journal article 2021

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Will Quantum Computers Scale without Inter-Chip Comms? A Structured Design Exploration to the Monolithic vs Distributed Architectures Quest

Rodrigo, Santiago (author), Abadal, Sergi (author), Alarcon, Eduard (author), Almudever, Carmen G. (author)

Being a very promising technology, with impressive advances in the recent years, it is still unclear how quantum computing will scale to satisfy the requirements of its most powerful applications. Although continued progress in the fabrication and control of qubits is required, quantum computing scalability will depend as well on a...

conference paper 2020

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Realistic simulation of quantum computation using unitary and measurement channels

Moueddene, A.A. (author), Khammassi, Nader (author), Bertels, K.L.M. (author), Almudever, Carmen G. (author)

The implementation and practicality of quantum algorithms hinge largely on the quality of operations within a quantum processor. Therefore, including realistic error models in quantum computing simulation platforms is crucial for testing these algorithms. Existing classical simulation techniques of quantum information processing devices...

journal article 2020

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Cryo-CMOS interfaces for large-scale quantum computers

Sebastiano, F. (author), van Dijk, J.P.G. (author), Thart, P. A. (author), Patra, B (author), van Staveren, J. (author), Xue, X. (author), Almudever, Carmen G. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Vladimirescu, A. (author), Babaie, M. (author), Charbon-Iwasaki-Charbon, E. (author)

Cryogenic CMOS (cryo-CMOS) is a viable technology for the control interface of the large-scale quantum computers able to address non-trivial problems. In this paper, we demonstrate state-of-the-art cryo-CMOS circuits and systems for such application and we discuss the challenges still to be faced on the path towards practical quantum...

conference paper 2020

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On Structured Design Space Exploration for Mapping of Quantum Algorithms

Bandic, M. (author), Zarein, Hossein (author), Alarcon, Eduard (author), Almudever, Carmen G. (author)

Quantum algorithms can be expressed as quantum circuits when the circuit model of computation is adopted. Such a circuit description is usually hardware-agnostic, that is, it does not consider the limitations that the quantum hardware might have. In order to make quantum algorithms executable on quantum devices they need to comply to their...

conference paper 2020

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Fault-tolerant quantum error correction on near-term quantum processors using flag and bridge qubits

Lao, L. (author), Almudever, Carmen G. (author)

Fault-tolerant (FT) computation by using quantum error correction (QEC) is essential for realizing large-scale quantum algorithms. Devices are expected to have enough qubits to demonstrate aspects of fault tolerance in the near future. However, these near-term quantum processors will only contain a small amount of noisy qubits and allow...

journal article 2020

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Realizing Quantum Algorithms on Real Quantum Computing Devices

Almudever, Carmen G. (author), Lao, L. (author), Wille, Robert (author), Guerreschi, Gian G. (author)

Quantum computing is currently moving from an academic idea to a practical reality. Quantum computing in the cloud is already available and allows users from all over the world to develop and execute real quantum algorithms. However, companies which are heavily investing in this new technology such as Google, IBM, Rigetti, Intel, IonQ, and...

conference paper 2020

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Multiplexed quantum transport using commercial off-the-shelf CMOS at sub-kelvin temperatures

Paquelet Wuetz, B. (author), Bavdaz, P.L. (author), Yeoh, L.A. (author), Schouten, R.N. (author), van der Does, C.H. (author), Tiggelman, M.J. (author), Sabbagh, D. (author), Sammak, A. (author), Almudever, Carmen G. (author), Sebastiano, F. (author), Clarke, J. S. (author), Veldhorst, M. (author), Scappucci, G. (author)

Continuing advancements in quantum information processing have caused a paradigm shift from research mainly focused on testing the reality of quantum mechanics to engineering qubit devices with numbers required for practical quantum computation. One of the major challenges in scaling toward large-scale solid-state systems is the limited input...

journal article 2020